From: Jeff Moore <jcmoore@...>
Date: 2009-06-07T07:43:53+09:00
Subject: Re: STDIN, OUT, ERR and $stdin, out, err - Differences?

Terry Cooper wrote:
> Can anyone explain what's happening here?
> 
> print $stdin.fileno  => 0
> print $stdout.fileno => 0
> print $sterr.fileno  => 0
> 
> print STDIN.fileno  => 0
> print STDOUT.fileno => 1
> print STDERR.fileno => 2
> 
> print STDOUT.object_id     => 21673330
> print $stdout.object_id    => 21673330
> 
> I get the same results in and out of eclipse and with irb
> 
> ruby 1.8.6, XP
> 
> Many thanks.

Simply, STDIN, STDOUT, STDERR are CONSTANTS and
$stdin, $stdout, and $stderr are global variables.

They are the same initially but the variables can
be re-assigned.
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